BUG: Attach prediction start date in AR. Closes #773.
Merge pull request #774 from jseabold/fix-773

BUG: Attach prediction start date in AR. Closes #773.
BUG: Fix dates_from_range with length. Closes #775.
Merge pull request #776 from jseabold/fix-775

BUG: Fix dates_from_range with length. Closes #775.
DOC: Fix docstring. Add example.
DOC: Add ANOVA to sphinx docs. Closes #770.